吸收增强式甲烷水蒸气重整制氢循环反应模拟

Modeling of hydrogen production by sorption enhanced methane steam reforming reactions

吸收增强式甲烷水蒸气重整制氢反应可以生成高浓度的H2和较低浓度的CO、CO2。研究建立了考虑钙基吸收剂活性下降对吸收增强式甲烷水蒸气重整制氢过程影响的多次循环反应模型,在实验数据验证的基础上,计算了三种吸收剂活性下降特性对吸收增强式重整制氢过程的影响。结果表明,对于石灰石吸收剂,产生高纯H2的时间随循环次数的增加而急剧下降;白云石循环反应活性提高,产生高纯H2的时间随循环次数的增加而缓慢下降;CaO/Ca12Al14O33的循环使用次数明显大于石灰石和白云石。

High concentration of H2 with a low concentration of CO and CO2 can be produced by the sorptionenhanced methane steam reforming with the CO2 sorbent addition. A mathematic model for the sorption enhanced methane steam reforming considering the activity loss of Ca-based sorbents was developed and verified by the experimental data. The effect of the activity decay of three Ca-based sorbents on the process of hydrogen production was explored by model calculation. The results indicate that the breakthrough time for high concentration of hydrogen production reduces rapidly with the cycle numbers increasing for a limestone sorbent, while the break- through time decreases gradually for a dolomite sorbent. The effective cycle umber of CaO/Ca12Al14O33 sorbent is far more than that of dolomite and limestone.